介绍一个asp.net上传图片的程序

把图片读到pictureBox，再写入数据库SqlConnection conn=new SqlConnection(@"data source=chenyuming2004\VSdotNET;uid=sa;pwd=cym;database=lhf");
conn.Open();
SqlCommand cmd=new SqlCommand("insert into fuser values ('1a','1b',@i)",conn);
byte[] ib=new Byte[60000];
FileStream fs=new FileStream(@"D:\windows temp\temp\1.jpg",FileMode.Open ,FileAccess.Read );
fs.Read(ib,0,60000);
cmd.Parameters.Add("@i",SqlDbType.Image,(int)fs.Length);
cmd.Parameters["@i"].Value=ib;
cmd.ExecuteNonQuery();
conn.Close();-------------------------------------------------------
从数据库读图片到pictureboxSqlConnection conn=new SqlConnection(@"data source=chenyuming2004\VSdotNET;uid=sa;pwd=cym;database=lhf");
conn.Open();
SqlCommand cmd=new SqlCommand("select 照片 from fuser where password='1b'",conn);
SqlDataReader reader=cmd.ExecuteReader();
reader.Read();
MemoryStream buf=new MemoryStream((byte[])reader[0]);
Image image=Image.FromStream(buf,true);
pictureBox1.Image=image;===============asp.net上传图片并同时生成缩略图     ouwx [原作]
关键字   缩略图,上传图片
出处

<script language="VB" runat="server">
Sub UploadFile(sender As Object, e As EventArgs)If FileUp.PostedFile.ContentLength = 0 Then
FileInfo.Visible = False
Exit Sub
Else
FileInfo.Visible = True
FDisplay1.Visible = True
End IfFSize.Text ="上传文件大小"+ CStr(FileUp.PostedFile.ContentLength/1024)+"KB"
FName.Text = "已上传文件名:"+FileUp.PostedFile.FileName+"<br/>"+FName.Text'写入数据库
on error resume next
dim myconn as sqlconnection
dim mycomm as sqlcommand
dim sql as string
dim id as integer
Dim image,anewimage As System.Drawing.Image
dim width,height,newwidth,newheight as integer
Dim callb As System.Drawing.Image.GetThumbnailImageAbort
myConn=New sqlconnection(ConfigurationSettings.AppSettings("数据库"))
myconn.open()
sql="insert into picture (姓名,班级,介绍,属性) values ('"&request.cookies("dgxyl").values("dgxylname")&"','"&request.cookies("dgxyl").values("dgxylbj")&"','"&trim(request("TextBox1"))&"','"&request("r1")&"')"
Mycomm=New sqlcommand(sql,myconn)
mycomm.executenonquery()
myconn.close()Dim myCommand As New SqlCommand("select top 1 id from picture order by id desc", myConn)
myCommand.Connection.Open()
Dim myReader As SqlDataReader=mycommand.executereader()
if myReader.Read() then
id=myReader("id")
end if
myconn.close()
'保存图片
FileUp.PostedFile.SaveAs( Server.MapPath("\classpic\")&cstr(id)&".jpg" )
'生成缩略图
image=System.Drawing.Image.FromFile(Server.MapPath("/classpic/"+cstr(id)+".jpg"))
width=image.Width
height=image.height
if width>height then
newwidth=250
newheight=image.height/image.Width*newwidth
else
newheight=250
newwidth=image.Width/image.height*newheight
end if
response.write("id="+cstr(id)+"width="+cstr(Width)+";height="+cstr(height)+"  ")
response.write("newwidth="+cstr(newwidth)+";newheight="+cstr(newheight)+"<br/>")aNewImage=image.GetThumbnailImage(newwidth,newheight,callb,new System.IntPtr())
aNewImage.Save(Server.MapPath("/smallpic/"+cstr(id)+".jpg"))
image.Dispose()
Dim FileSplit() As String = Split( FileUp.PostedFile.FileName, "\" )
Dim FileName As String = FileSplit(FileSplit.Length-1)
Dim Exts() As String = Split( FileName, "." )
Dim Ext As String = LCase(Exts(Exts.Length-1))FDisplay.Text = "<A Target='_blank' HREF='/classpic/"&cstr(id)&".jpg"& "'>查看上传文件</A>"
FDisplay1.text="<a href='/picture/default.asp?bj="&cstr(request.cookies("dgxyl").values("dgxylbj"))&"'>返回</a>"
End Sub
</script>
<SCRIPT language=JavaScript>

</SCRIPT>
<Html>
<Body BgColor=White>
<H3 align="center">请正确填写下面各项</h3>
<Hr></H3>
<Div id="FileInfo" Visible="False" runat="server">
<Asp:Label id="FSize" runat="server"/><br/>
<Asp:Label id="FName" runat="server"/><br/>
<Asp:Label id="FDisplay" runat="server"/>
<Asp:Label id="FDisplay1" runat="server"/>
</Div>
<Form Enctype="multipart/form-data" onsubmit="return guestbook_Validator(this)" runat="server">
上传文件
<Input Type="File" id="FileUp" runat="server" size="20"><br/>
图片属性：<input type="radio" value="<%=request.cookies("dgxyl").values("dgxylbj")%>" name="R1" checked>本班<input type="radio" value="全校" name="R1">全校(本班则只在本班显示，全校则在全校显示)<P>
图片说明：<br/>
<asp:TextBox id="TextBox1" runat="server" Width="233px" Height="141px">
</asp:TextBox>
        <asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="请输入图片说明">
</asp:RequiredFieldValidator><br/>
<Asp:button id="Upload" OnClick="UploadFile" Text="上传图片" runat="server"/>
</form>
<Hr>
<p>注意：</p>
<ol>
  <li><b>严禁上传污染环境的照片，否则账号将被删除！</b></li>
  <li><font color="#808000"><b>请详细填写照片说明，图片说明不详细将会被视为乱传图片，将会被删除！</b></font></li>
</ol>
<p>　</p></Body>
</Html>
<%@ Page Language="c#" Debug="true" Trace="true"%>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<html>
<script runat =server>
      void UploadBtn_Click(Object sender, EventArgs e) {
         String filename;
         String filename1;
         String[] filename2;
         int q;
         filename=UploadFile.PostedFile.FileName ;
         filename2=filename.Split(new Char[] {'\\'});
         q=filename2.GetUpperBound(0);
         filename1=filename2[q];
         dis.Text="上传文件名："+filename1+"<br/>";
         UploadFile.PostedFile.SaveAs(Server.MapPath(filename1));
         ImageEditor.Visible = true;
         dis.Text+="文件大小："+UploadFile.PostedFile.ContentLength+"字节数";
         Image1.Src=filename1;
      }
      void UpdateBtn_Click(Object sender, EventArgs e) {
        String filename1;
   filename1=Image1.Src;
   System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath(filename1));
   System.Drawing.Image newimage = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppRgb);
   Graphics g = Graphics.FromImage(newimage);
   g.DrawImage(image,0,0,image.Width,image.Height);
   Font f = new Font(FontType.SelectedItem.Text, Int32.Parse(FontSize.SelectedItem.Text));
   Brush b = new SolidBrush(Color.Red);
   g.DrawString(Caption.Text, f, b, 10, 140);
   g.Dispose();
   //System.Drawing.Image thumbImage = newimage.GetThumbnailImage(Convert.ToInt32(Width.Text),Convert.ToInt32(Height.Text),null,0);
   image.Dispose();
  // thumbImage.Save(Server.MapPath(filename1), ImageFormat.Jpeg);
   Image1.Src=filename1;
   Caption.Text="";
      }   </script>   <body>
private void  SaveImages()
{
///'遍历File表单元素
HttpFileCollection files  = HttpContext.Current.Request.Files;
try
{
if(txtid.Text!="")
{
///'检查文件扩展名字
HttpPostedFile postedFile = files[0];
string fileName, fileExtension;
fileName = System.IO.Path.GetFileName(postedFile.FileName);
if (fileName != "")
{
fileExtension = System.IO.Path.GetExtension(fileName);
if(fileExtension==".JPG"||fileExtension==".BMP")
{
///'可根据扩展名字的不同保存到不同的文件夹
///注意：可能要修改你的文件夹的匿名写入权限。
postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("images/") + fileName);
Image1.ImageUrl=System.Web.HttpContext.Current.Request.MapPath("images/") + fileName;
company c=new company();
c.simageurl=System.Web.HttpContext.Current.Request.MapPath("images/") + fileName;
c.sCompanyID=txtid.Text;
c.updateimage();
Image1.Height=250;
Image1.Width=400;
}
else
{
Page.RegisterStartupScript("key","<script>alert('图片格式不正确!')</script>");
}
}

}
else{
Page.RegisterStartupScript("key","<script>alert('请选择公司!')</script>");
}
}
catch(System.Exception err)
{
Session["error"]=err.Message;
Response.Redirect("error.aspx");

}

调试易

介绍一个asp.net上传图片的程序

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